Why does the app keep sending me back to a log in screen?

I updated this app recently, and now I have to keep logging in. In fact, as I was trying to input my food for lunch today, it kicked me out and went back to the log in page. Whats up with that, MFP? Get it fixed.

UnsafePrune about MyFitnessPal: Calorie Counter, v7.4.1